Apple MacBook Pro 13″ Laptop A1278 Memory Upgrade | MT Systems
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
A-Tech 8GB Kit (2x4GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/
CMS 8GB (1X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core I5 2.4 13.3" Md313Ll/A A1278 - A14 at Amazon.com
Apple MacBook Pro A1278 (Early 2011) 13"-Core i7, 2.7GHz 8GB RAM, 750GB HDD - Apple Force
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com